netdev - Re: [PATCH iproute2-next v2 1/2] dcb: add new pcp-prio parameter to dcb app

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Date:   Tue, 29 Nov 2022 10:35:08 +0100
From:   Petr Machata <petrm@...dia.com>
To:     Daniel Machon <daniel.machon@...rochip.com>
CC:     <netdev@...r.kernel.org>, <dsahern@...nel.org>,
        <stephen@...workplumber.org>, <petrm@...dia.com>,
        <maxime.chevallier@...tlin.com>, <vladimir.oltean@....com>,
        <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH iproute2-next v2 1/2] dcb: add new pcp-prio parameter to
 dcb app


Daniel Machon <daniel.machon@...rochip.com> writes:

> Add new pcp-prio parameter to the app subcommand, which can be used to
> classify traffic based on PCP and DEI from the VLAN header. PCP and DEI
> is specified in a combination of numerical and symbolic form, where 'de'
> (drop-eligible) means DEI=1 and 'nd' (not-drop-eligible) means DEI=0.
>
> Map PCP 1 and DEI 0 to priority 1
> $ dcb app add dev eth0 pcp-prio 1nd:1
>
> Map PCP 1 and DEI 1 to priority 1
> $ dcb app add dev eth0 pcp-prio 1de:1
>
> Internally, PCP and DEI is encoded in the protocol field of the dcb_app
> struct. Each combination of PCP and DEI maps to a priority, thus needing
> a range of  0-15. A well formed dcb_app entry for PCP/DEI
> prioritization, could look like:
>
>     struct dcb_app pcp = {
>         .selector = DCB_APP_SEL_PCP,
> 	.priority = 7,
>         .protocol = 15
>     }
>
> For mapping PCP=7 and DEI=1 to Prio=7.
>
> Also, three helper functions for translating between std and non-std APP
> selectors, have been added to dcb_app.c and exposed through dcb.h.
>
> Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>

Reviewed-by: Petr Machata <petrm@...dia.com>